function identify(context){
    return context.name.toUpperCase()
}

function speak(context){
    var greeting = "hello,I'm" + identify(context)
    console.log(greeting)
}
var me = {
    name:'wn'
}
var you = {
    name:'zj'
}
// let result = identify.call(me)
// let result2 = identify.call(you)
// // console.log(result);
// // console.log(result2);

// speak.call(me)
// identify(me)
speak(me)